This is a timeline for those organisations which do not fall into the other categories listed below. As such it is likely to be reorganised when there are sufficient entries.
- 1919 Academia Mexicana de la Historia
- 1932 Prince Albert Historical Museum
- 1941 Arkansas Historical Association
- 1956 Alabama Historical Commission
- 1977 Sources (website)
- 1989 Preservation Iowa/Iowa Historic Preservation Alliance (IHPA) founded
- 2002 Redalyc established.
- 2010 Colorado History Museum closes
- 2012 28 April History Colorado Center opened